Information about Rubidium-81:


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Mass-Energy Data:

Atomic Mass:	80.918994	±	0.000007	amu
Excess Mass (Δ):	-75.456438	±	0.006274	MeV
Binding Energy:	700.286509	±	0.006274	MeV
β^- Decay Energy:	-3.929907	±	0.009638	MeV

"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.

Radioactive Decay Data:

Spin: 3/2-
Half life: 4.576 h ( 16473.6 sec., λ = 4.20762×10^-05 s^-1)
Mode of decay:
E.C.
to
81
36
Kr
(Q = 2.237 MeV)
Meta state at 0.086 Mev
Spin: 9/2+ 4.576
Half life: 30.5 min ( 1830 sec., λ = 0.000378769 s^-1)
Mode of decay: γ (IT) (Q = 0.086 MeV) Branch ratio: 97.60 %
Mode of decay:
E.C.
to
81
36
Kr
(Q = 2.323 MeV) Branch ratio: 2.40 %
Possible parent nuclides:
E.C. from
81
38
Sr

R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)

Magnetic Dipole Moments and Electric Quadrupole Moments
Ex(kev)	T_1/2	Spin	m(nm)	Q(b)	Ref. Std.	Method	Reference
0	4.58 h	3/2-	+2.0595(14)		[87Rb]	ABLS	PR C23 2720 (81)
				+0.40(2) st		ABLS	PR C23 2720 (81)
86	32 m	9/2+	+5.598(2)		[87Rb]	ABLS	PR C23 2720 (81)
				-0.74(6) st		ABLS	PR C23 2720 (81)

N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published. 2000 Courtesy of T. Burrows at BNL/NNDC.